Hi Detlef,
I like your kris!
It looks like an old warrior!
Recently a moro kris arrived here with the same kind of varnish that is on your blade.
Try to get that off, and give the blade a slight etch after getting rid of the surface rust, it will look as reborn than.
Please don't wash the fabric. I would leave it as it is, just as the handle!
It is better that it smells like moro than if it would smell like lotion.
Maybe you could give the scabbard a light wax to bring new live in the wood.
Maurice